Balancing apparatus for wheels



(No Model.) 2 Sheets-Sheet 1.

T. A. GRIFFIN.

BALANGING APPARATUS POR WHEELS, aw. No. 407,589. Patented July 23, 1889.

(No Model.) 2 Sheets- Sheet T. A. GRIFFIN. BALANGING APPARATUS FOR WHEELS, Aw.

No. 407,589. l Patentd July 23., 1889.

in. the drawings no f Y UNITED STATES PATENT OFFICE.

THOMAS A. GRIFFIN, OF CHICAGO, ILLINOIS.

BALANCING APPARATUS FOR WHEELS&C.

SPECIFICATION forming part of Lettersatent No. 497,589, dated July 23, 1889.-` Application iled April Z6, 1889. Serial No. 308,736. (No model.) I

T all whom it may concern: 4

-Be it known that I, THoMArs A. GRIFFIN, of Chicago, in the county of Cook and State of Illinois, have invented certain new anduseful Improvements in Balancing Apparatus, of

which the following is a specification.

The object of my invention is to facilitate the balancing of pulleys, car and l'lfy wheels, and other parts of machinery which are destined to revolve at high speeds, by providing means for ascertaining the amount the pulley or other part is out of balance, and for locating the position of the heaviest part with expedition: -In addition, to further assist in the attainment of the object of my invention, I provide means for preparing and attaching the counterbalan cin gweigh t to the pulley or Wheel while in position in the balancing-machine.

In the accompanying drawings, Figure 1 is avertical longitudinal section ofmy improved apparatus, showing a car-wheel in position for balancing. Fig. 2 is a plan view of the apparatu s, the car-wheel being shown in section. Fig. 3 is an elevation looking from the right of Fig. 2. Fig. 4 is an elevation of the part to the left of the dotted line xx, Fig. 2. Figs. 5, G, and 7 are detail views on an enlarged scale.

' 2, Figs. l and 2, is a mandrel upon which the pulley or Wheel is mounted for balancing.

I t may be of any sort,'but asv shown itis an expandingmandrel, that form being preferable by reason of the facility withwhich `it maybe inserted and removed. No novelty is claimed for theexpanding devices, and as Athefe'ssifrtial lfeatures of construction appear urther-description of -this I :portionis necessary.

The ends of the mandrel 2 rest on anti-fricv"tion rollers 3 3 4"'4, journaled inthe vstandards 6, which constitute a part of the frame of the machine. A disk 7 is rigidly secured to the mandrel 2, and a lever 8 is hung thereon so that itmay vibrate in proximity to the disk. Upon the lever 8 is -pivoted an eccentric'Q, whose edge is in contact with the edge of the disk 7. The structurel of the eccentric 9 is shown in Figs. 5, 6, and 7. A curved or coiled the disk 7 and eccentric 9. The eccentric 9 is thus adaptedI to act as afriction-clutch, and is arranged so that when the lever8is'moved in the direction ofthe arrow, Fig. 3 or 5, the 5 5- disk 7 and the attached mandrel and pulley or wheel will be rotated, while the leverwill be freed when moved in the opposite ldirection. Thel lever 8 projects on both sides ot' the mandrel 2, one end being provided-witha 6o balancing-Weight 1l, by which the leveritself may be poised, while the other end is provided with a spring-scale l2V or other device by which the Aforce applied in turning the mandrel and pulley may be determined. The balancing 1 6 5 of the lever 8 by the Weight 11 is not essential, as will be evident when the operation comes to be considered; but is a convenience because the scale will then correctly indicate the force required to rotate the mandrel.

Mounted at the rear of' the apparatus between the standards 5 and 13, Figs. 1 and 2,

isa drilling-machine 1:1,thc drill-spindle of which vis made adjustable by Well-known devices, so that it may be fixed at any angle or in any position Within its ranger Power for driving the drill is transmitted through the rope 16, passing round'the pulley 18 and tightener-pulleys 17, Figs. 2 andfi'. An emery-Wheel 19 is also mounted at thel rear of the machine, and is used for fitting and reducing the counterbalance-weight when the precise weight needed has been ascertained.

The mode of using the apparatus herein-V above described is as follows: The mandrel 2 is driven into the wheel or pulley to be balanced and placed upon the rollers 3 3 4 4. The spring-scale 12- is slid along the lever or scale beam 8 toany convenient point, varying with the size and weight of the pulley operated upon, but preferably toa position corresponding to the radial distance vproposed for the counter-Weight. Pressure barely suficient to turn the mandrel is applied to the springscale and its reading noted. Another portion of the pulley or wheel is then brought uppermost and the pressure required to turn it again noted. Several diametrically-opposite points are .thus tested. As .the frictional resistance is the same for all positions, the 'comparison ofl the'diierent readings willy s how the location of the'heaviest spot, and one-half the differ- IOO ence'between the greatest and least opposite readings will be the amount of counter-balance needed if placed at the radial distance of the Weighing-scale. A Weight of the proper size, being selected or prepared by grinding on the Wheel 19 or otherwise, is then temporarily secured to the pulley or wheel, and it desired its suiciency tested by noting whether the pressure required to revolve the wheel is the same in all positions. The counterbalance-weight is then permanently secured by drilling through it and the Wheel before the latter is removed from the balancing-machine and inserting a rivet or other fastening. The thrust of the drill against the wheel is,l taken by the screw 2l, passing through the brace 22, Figs. l and 2, and abutting against the end of the mandrel.

I claim- 1. The combination, with the mandrel adapted to receive the wheel or pulley to be balanced, and supports for said mandrel on which it may revolve, of a lever adapted to revolve said mandrel and provided witha device for Weighing the force applied in revolving the mandrel,substantially as described.

'2. The combination, in a balancing apparatus, of a mandrel adapted to receive the wheel or pulley to be balanced, supports for said mandrel on whieh'it may revolve, a vibratable lever, a clutch connecting said lever to said mandrel and adapted 'to move it in one direction only, and a device attached to said lever for Weighing the force applied to revolve the mandrel, substantially as described.

3. The combination, in a balancing apparatus, of a mandrel adapted to receive the wheel or pulley to be balanced, supports for said mandrel in which it may revolve, a vibrat able lever hung upon said mandrel and connected by a clutch thereto, and a weighing dcvice adjustable on said lever vto correspond withthe intended positioirof the counterweight, substantially as described.

4. The combination, in a balancing apparatus, of a mandrel adapted to receive the pulley or Wheel to be balanced, supports for said mandrel on which it may revolve, a lever having a Weighing device attached and `adapted to revolve the mandrel, and a drill adjustably mounted in the frame carrying' the supports for the mandrel, whereby the entire operation of balancing a wheel or pnlley may be completed prior to its removal from the apparatus.

THOMAS A. GRIFFIN.

Witnesses:

IRWIN VEEDER, P. il. T. MAsoN. 

